[ovirt-users] Live merge speed

Sun Nov 6 15:10:41 EST 2016

Hi Markus,

can you send an update to the list if this does help as well?

Thanks

Kai

Am 06.11.2016 um 20:32 schrieb Markus Stockhausen:
> Hi Maor,
>
> from our observation it MIGHT come from the xfs filesystem on the NFS storage.
> qemu thin provisioned raw disks of linux database VMs tend to fragment heavily
> during growth. Some of the disk images have > 1.000.000 extends.
>
> To sort it out we have fixed the extendsize of the OVirt mount point to 1M
> (xfs_io -c 'extsize 1m' /var/nas/OVirt). If this does not help I will send you some
> update.
>
> Best regards.
>
> Markus
>
>
> Von: Maor Lipchuk [mlipchuk at redhat.com]
> Gesendet: Sonntag, 6. November 2016 16:33
> An: Markus Stockhausen
> Cc: Ovirt Users
> Betreff: Re: [ovirt-users] Live merge speed
>
> Hi Markus,
>
> Can you try to use dd on a random file in that storage domain, What is the performance it reflects?
> Just want to make sure what is the origin of the problem, if  it is related to the storage domain or the qemu process.
>
> Regards,
> Maor
>
> On Thu, Nov 3, 2016 at 8:09 PM, Markus Stockhausen
> <stockhausen at collogia.de> wrote:
>
> Hi there,
>
> in the past we already observed that live merge operations may take some time.
> Currently another of those operations is running on one of our VMs on a
> CentOS 7/qemu 2.3 node. Storage is (async - yeah I know about potential data
> loss) NFS over 10GBit network.
>
> The operation is running for 50 minutes now with an average throughput of
> 5MByte/sec. The disk (defined at 400GB) and its snapshots does not show much
> thin provisioning:
>
> ls -al
> -rw-rw----.   1 vdsm kvm 429496729600  7. Apr 2016  a204865e-ef57-41e0-a2ac-465a6c9c3d60
> -rw-rw----.   1 vdsm kvm 203334418432  3. Nov 2016  aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> -rw-rw----.   1 vdsm kvm 192091389952  3. Nov 2016  c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
> du -m a204865e-ef57-41e0-a2ac-465a6c9c3d60
> 383070  a204865e-ef57-41e0-a2ac-465a6c9c3d60
> du -m aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> 193953  aeda833f-1f4b-4b6f-b553-578f1f3f06ee
> du -m c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
> 183222  c8acdbc7-af24-4c5c-94c5-ae7262d98f5c
>
> Usually at some point the process is gaining speed and we see >100MByte/sec
> speed. Can anyone explain what might be going on.
>
> Best regards.
>
> Markus Stockhausen
>
>
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